A compound of formula (I) or a pharmaceutically acceptable salt thereof:
in which A represents a bond or -CH₂- and B represents hydrogen, or A and B together with carbon atom to which they are both attached represents a group -CH=C ; R represents R₁OOC- in which R₁ is C1-4 alkyl, C2-4 alkenyl or C2-4 alkynyl; R₂O- in which R₂ is C1-3 alkyl, C1-2 alkylcarbonyl or aminocarbonyl optionally substituted by one or two methyl groups; or R₃CH₂⁻ in which R₃ is C1-2 alkoxy; and p represents an integer of 2 to 4, and wherein compounds of formula (I) where B is hydrogen have the stereochemical configuration in which the group R and the methylene bridge are both on the same side of the plane of the molecule which contains both bridge head atoms and the ring carbon atom bonded to the group R.
一种式(I)化合物或其药学上可接受的盐:
其中 A 代表键或-CH₂-,B 代表氢,或 A 和 B 连同它们所连接的碳原子代表一个基团 -CH=C;R 代表 R₁OOC-,其中 R₁ 是 C1-4 烷基、C2-4 烯基或 C2-4 烷炔基;R₂O-,其中 R₂ 是 C1-3 烷基、C1-2 烷基羰基或可选被一个或两个甲基取代的
氨基羰基;或 R₃CH₂-,其中 R₃ 是 C1-2 烷氧基;以及 p 代表 2 至 4 的整数,其中 B 是氢的式 (I) 化合物具有立体
化学构型,其中基团 R 和亚甲基桥位于分子平面的同一侧,分子平面包含桥头原子和与基团 R 键合的环碳原子。